Tieton Dam, Okanogan–Wenatchee National Forest

Tieton Dam is an earth and concrete type dam on the Tieton River in Yakima County, in the U.S. state of Washington. The dam began operation in 1925. Its reservoir, Rimrock Lake, has a total capacity of 203,600 acre-feet with a normal operating capacity of 198,000 acre-feet to provides water for agricultural irrigation. This dam is a component of the Yakima Project. Upstream from the dam, the river is impounded by Clear Creek Dam, another element of the Yakima Project. About 8 miles downstream from the dam, the Tieton River is tapped for the Tieton Main Canal. ()